It is most important to have some method of recording where the fossils
were found. It is very easy to forget where the material was collected,
and one should _never_ rely on memory. A small pocket-sized notebook is
inexpensive and just the right size to carry in the field.
A highway or county map should be used to find the geographic location
of each collecting locality. Maps of Texas counties can be obtained from
the Texas Highway Department, File D-10, Austin 14, Texas. These maps
come in three different sizes, but for most purposes the 18×25-inch
sheets, with a scale of ½ inch = 1 mile, will be satisfactory. These are
available for all counties and may be purchased at a nominal price.